P2P: Set operating class along with operating channel width

While setting up the P2P GO interface, wpa_supplicant sets the operating
channel width to CHANWIDTH_USE_HT in cases where it fails to set 80 MHz
bandwidth. In the same flow, update the operating class, too, according
to the channel width. This is to avoid setting up the operational
channel width back to 80 MHz from hostapd interface setup.

Signed-off-by: Sunil <sunilravi@google.com>

wpa_supplicant/ap.c

@@ -175,6 +175,9 @@ no_vht:
 	hostapd_set_oper_centr_freq_seg0_idx(
 		conf, conf->channel + conf->secondary_channel * 2);
 	hostapd_set_oper_chwidth(conf, CONF_OPER_CHWIDTH_USE_HT);
+	ieee80211_freq_to_channel_ext(ssid->frequency, 0,
+				      conf->vht_oper_chwidth,
+				      &conf->op_class, &conf->channel);
 }